If you can get up in the attic, check that your soffit vents aren't blocked by either insulation or 'stuff'. Also, your rafter-chutes should be 'free and clear' of any 'stuff' you store up there too. IN short, you want the air entering the soffit to have a FREE and CLEAR path to the ridge vent.
A few years ago, I installed a thermostatically controlled gable fan that comes on at 105 degrees. Sometimes it gets as hot as 130 degrees up there in spite of having soffit, gable, AND ridge venting.